39971937 has 4 divisors (see below), whose sum is σ = 53295920. Its totient is φ = 26647956.

The previous prime is 39971933. The next prime is 39971959. The reversal of 39971937 is 73917993.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 73917993 = 3 ⋅24639331.

It is not a de Polignac number, because 39971937 - 2² = 39971933 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39971933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6661987 + ... + 6661992.

It is an arithmetic number, because the mean of its divisors is an integer number (13323980).

Almost surely, 2^39971937 is an apocalyptic number.

It is an amenable number.

39971937 is a deficient number, since it is larger than the sum of its proper divisors (13323983).

39971937 is a wasteful number, since it uses less digits than its factorization.

39971937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13323982.

The product of its digits is 321489, while the sum is 48.

The square root of 39971937 is about 6322.3363561266. The cubic root of 39971937 is about 341.9151921994.

The spelling of 39971937 in words is "thirty-nine million, nine hundred seventy-one thousand, nine hundred thirty-seven".